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Can DDoS attacks harm your server and how to prevent them?

DDoS (distributed denial-of-service) attack is one of the most common forms of cyber-attacks these days. Their scale already exceeds one terabit per second and over 2000 of such attacks are being observed daily by Arbor Networks. So, should you care? Surely! It’s important to secure your network to stay calm and ensure uninterrupted services to your customers.
Possible Harm
DDoS attacks disturb regular tasks of a targeted computer system by flooding it with bogus traffic from numerous compromised machines. As a simple example, if your e-commerce site is under DDoS attack, your customers are withheld from placing new orders. If it’s a call center, your clients cannot make or receive calls. If it’s a booking engine, your clients are not able to make new reservations. In other terms, your service is being denied. Still, can these service disruptions make a lasting impact on your system and harm your customer base? Let’s try to answer this point by point.
How to avoid DDoS?
As DDoS attacks keep growing in volume and frequency, we should prevent them from making harm to your projects. You should plan ahead to secure your network and minimize the impact of such intrusion. So how to prevent ddos attacks?
Conclusion
Hackers are getting better each day with more and more methods available for finding vulnerable systems on the Internet. Nevertheless, there are now a lot of ways to protect your business and avoid DDoS attacks whatsoever. Do not hesitate to take preventative actions in advance and you will sleep well at night.

Originally posted at https://blog.cherryservers.com/ddos-attacks-and-their-prevention
submitted by diablom1980 to devops [link] [comments]

Electrum is hitting MAX_FEE_RATE sanity limit

There are several reports of people overpaying fees in the hundreds of dollars because of faulty fee estimation.
I'd like to give a little insight for Electrum
Electrum uses estimatefee from bitcoind as reported by the server and has a sanity limit client side of 300k Satoshi per kilobyte (currently 5.43 USD) or ~75k Satoshi (1,35 USD) for a ~250 byte tx to deal with faulty logic / fake reporting.
We're already hitting this client side sanity limit. The fee slider setting "In next block" still goes above the sanity limit because it's just 50% on top of "estimatefee 2" but I guess it's time to set manual fees for now if you have a high priority tx and need it to go through quickly.
Obviously with Electrum you can just send at the sanity limit and then make use of RBF (replace by fee) and bump the fee for a transaction further (manually) if it takes too long, so check whether you have that enabled in the settings and for your transactions.
At this price tag it's worth deciding yourself whether you want a higher fee or not by manual override. You can make a guesstimate yourself judging from the mempool backlog https://jochen-hoenicke.de/queue/#1w Note the graph shows fees as Sat(oshis) / byte, where the fee slider / manual input is total fee. The "preview" window in Electrum before you send the tx will also show Sat / byte for you to check your choice.
Edit: minor spelling fixes
submitted by etmetm to Bitcoin [link] [comments]

Posts everyone interested in cryptocurrency should read

Edit: WIP

Posts

Here are some great posts/articles everyone should read before speculating in cryptocurrency.
Post Date
50 Crypto Trading & Investing Lessons Learned Over The Past 5 Years January 2018
'Be Your Own Bank', A Cautionary Tale December 2017
I lost ~40k USD today. Reminder to keep coins off exchanges if you are not trading. February 2018
How the Bitcoin protocol actually works December 2013
Blockchain and Trust February 2019
Bitcoin: A Peer-to-Peer Electronic Cash System October 2008

Common Advice

Disclaimer Not my advice. Don't sue me.

Not your keys, not your Bitcoin.

This applies to all cryptocurrencies. The ownership of cryptocurrencies can only be determined using cryptography (hence "crypto" in the name). To be able to spend/receive and otherwise control units of a cryptocurrency you must have the corresponding private key. If you are using a cryptocurrency exchange to store your cryptocurrency you do not control the private key(s) corresponding to your coins, the exchange does. To control your private keys you must withdraw your coins to a local wallet stored on your phone/PC. It is highly recommended that you don't use a Windows computer to store your private keys (because Windows is very prone to malware). There are numerous examples of prominent exchanges stealing/losing their customers coins because the exchange had the private key(s) rather than the customer. The most well known such occurrence was Mt. Gox.
Being 'your own bank' (controlling your private keys) also means you are responsible for the safety of your coins. Use a deterministic wallet and write down your seed (on paper, not electronically) so that you do not lose your coins if your wallet is lost/corrupted. Encrypt your wallet so malware cannot easily 'scrape' your private keys. Be careful updating your wallets. Wallet updates are a known and actively exploited attack vector. Wallet updates may also contain bugs.

Do not invest more than you can afford to lose.

Cryptocurrency prices are extremely volatile and losses of 90% are common. The software is under continual development and so may contain bugs. If you chose to speculate, assume you will lose all of your money and so only speculate money you do not need to pay bills or debts.

Past performance does not guarantee future results.

If the price has behaved some way in the past, it does not guarantee it will perform that way again in the future. This is especially true on short timescales.

Don't HODL

A misspelling of the word 'hold'. A meme telling people not to sell. Do not base your financial decisions on memes. Have a rigorous plan of when you will sell and execute it without emotion/hesitation.

This time isn't different.

Past performance does not guarantee future results but past performance is the best indicator of long-term prices. Familiarize yourself with the graphs of the past, learn about how the price is cyclic and then only speculate once you are as familiar with the price history as someone who bought in 2013.
submitted by 4vWte1ovZK1i to u/4vWte1ovZK1i [link] [comments]

Electrum is hitting MAX_FEE_RATE sanity limit

There are several reports of people overpaying fees in the hundreds of dollars because of faulty fee estimation.
I'd like to give a little insight for Electrum
Electrum uses estimatefee from bitcoind as reported by the server and has a sanity limit client side of 300k Satoshi per kilobyte (currently 5.43 USD) or ~75k Satoshi (1,35 USD) for a ~250 byte tx to deal with faulty logic / fake reporting.
We're already hitting this client side sanity limit. The fee slider setting "In next block" still goes above the sanity limit because it's just 50% on top of "estimatefee 2" but I guess it's time to set manual fees for now if you have a high priority tx and need it to go through quickly.
Obviously with Electrum you can just send at the sanity limit and then make use of RBF (replace by fee) and bump the fee for a transaction further (manually) if it takes too long, so check whether you have that enabled in the settings and for your transactions.
At this price tag it's worth deciding yourself whether you want a higher fee or not by manual override. You can make a guestimate yourself judging from the mempool backlog https://jochen-hoenicke.de/queue/#1w Note the graph shows fees as Sat(oshis) / byte, where the fee slider / manual input is total fee. The "preview" window in Electrum before you send the tx will also show Sat / byte for you to check your choce.
submitted by etmetm to Electrum [link] [comments]

OKLMofficial - YouTube Garrison's NCLEX Tutoring - YouTube

For example, Japan passed a law to accept bitcoin as a legal payment method, and Russia has announced that it will legalize the use of cryptocurrencies such as bitcoin. And Norway’s largest online bank, Skandiabanken, integrates bitcoin accounts. To see Bitcoin price since 2009 to 2017 and 2018, Bitcoin price charts click read more. Spesmilo - Python/PySide RPC client (abandoned) Gocoin - WebUI client written in Go language, with a cold deterministic brain-wallet. btcd An alternative full node bitcoin implementation written in Go (golang). BlockCypher Full node bitcoin client built for scale and data centers, exposed through web APIs. Mycelium Awarded the prestigious "Best Mobile App" award by Blockchain.info in 2014, the ... Bitcoincharts is the world's leading provider for financial and technical data related to the Bitcoin network. It provides news, markets, price charts and more. Bitcoin Charts. Blocks: 481823: Total BTC: 16.523M: Difficulty: 923233068449: Estimated: 887736944047 in 1 blks : Network total: 7983858.406 Thash/s: Blocks/hour: 7.25 / 497 s: Home; Bitcoin; Markets; Charts; About. Oct 1, 2020 01:16 ... Bitcoin price tumbled after South Korea announced more measures to regulate bitcoin trading, including a potential shutdown of exchanges, amid volatile moves in the world’s third-largest cryptocurrency market. “Cryptocurrency speculation has been irrationally overheated in Korea,” the government said in a statement. “We cannot leave the abnormal situation of speculation any longer.” Spesmilo - Python/PySide RPC client (abandoned) Gocoin - WebUI client written in Go language, with a cold deterministic brain-wallet. btcd An alternative full node bitcoin implementation written in Go (golang). BlockCypher Full node bitcoin client built for scale and data centers, exposed through web APIs. MyCelium Awarded the prestigious "Best Mobile App" award by Blockchain.info in 2014, the ...

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OKLMofficial - YouTube

This video is unavailable. Watch Queue Queue. Watch Queue Queue For tutoring please call 856.777.0840 I am a registered nurse who helps nursing students pass their NCLEX. I have been a nurse since 1997. I have worked in a lot of nursing fields and I truly love ... Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Coinbase: Brian Armstrong, Bitcoin, Cryptocurrency and More, BTC Price Prediction stay home BLABLATOYS - ΠΑΠΑΔΟΠΟΥΛΟΣ ΣΩΤΗΡΗΣ 3,133 watching Live now

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